I was able to get Uru CC to work fine on my Win7 PC. Sometimes the issue is with the Video card on that PC, not the OS.
However, if the compatibility mode doesn't work, you might try playing the ONLINE version of URU. It has all of the same content of URU CC plus much more, and it is free. You have to create an account, and then download the game files from the INSTALL site, but once you do, it runs great on Win7 and has the extra bonus of allowing you to play with other folks from all over the world.
Lest you feel that this is uncomfortable for you to play the game with others in the game, you should know that there are ways of playing the game mostly privately where you rarely see anyone else.
Give it a try! PLAY URU Online